#include "visual_server_canvas.h"
#include "visual_server_global.h"
#include "visual_server_viewport.h"

void VisualServerCanvas::_render_canvas_item_tree(Item *p_canvas_item, const Matrix32& p_transform, const Rect2& p_clip_rect, const Color& p_modulate, RasterizerCanvas::Light *p_lights) {


	static const int z_range = VS::CANVAS_ITEM_Z_MAX-VS::CANVAS_ITEM_Z_MIN+1;
	RasterizerCanvas::Item *z_list[z_range];
	RasterizerCanvas::Item *z_last_list[z_range];

	for(int i=0;i<z_range;i++) {
		z_list[i]=NULL;
		z_last_list[i]=NULL;
	}


	_render_canvas_item(p_canvas_item,p_transform,p_clip_rect,Color(1,1,1,1),0,z_list,z_last_list,NULL,NULL);

	for(int i=0;i<z_range;i++) {
		if (!z_list[i])
			continue;
		VSG::canvas_render->canvas_render_items(z_list[i],VS::CANVAS_ITEM_Z_MIN+i,p_modulate,p_lights);
	}

}

void VisualServerCanvas::_render_canvas_item(Item *p_canvas_item,const Matrix32& p_transform,const Rect2& p_clip_rect, const Color &p_modulate,int p_z,RasterizerCanvas::Item **z_list,RasterizerCanvas::Item **z_last_list,Item *p_canvas_clip,Item *p_material_owner) {

	Item *ci = p_canvas_item;

	if (!ci->visible)
		return;

	Rect2 rect = ci->get_rect();
	Matrix32 xform = p_transform * ci->xform;
	Rect2 global_rect = xform.xform(rect);
	global_rect.pos+=p_clip_rect.pos;


	if (ci->use_parent_material && p_material_owner)
		ci->material_owner=p_material_owner;
	else {
		p_material_owner=ci;
		ci->material_owner=NULL;
	}


	Color modulate( ci->modulate.r * p_modulate.r, ci->modulate.g * p_modulate.g,ci->modulate.b * p_modulate.b,ci->modulate.a * p_modulate.a);

	if (modulate.a<0.007)
		return;


	int child_item_count=ci->child_items.size();
	Item **child_items=(Item**)alloca(child_item_count*sizeof(Item*));
	copymem(child_items,ci->child_items.ptr(),child_item_count*sizeof(Item*));

	if (ci->clip) {
		if (p_canvas_clip != NULL) {
			ci->final_clip_rect=p_canvas_clip->final_clip_rect.clip(global_rect);
		} else {
			ci->final_clip_rect=global_rect;
		}
		ci->final_clip_owner=ci;

	} else {
		ci->final_clip_owner=p_canvas_clip;
	}

	if (ci->sort_y) {

		SortArray<Item*,ItemPtrSort> sorter;
		sorter.sort(child_items,child_item_count);
	}

	if (ci->z_relative)
		p_z=CLAMP(p_z+ci->z,VS::CANVAS_ITEM_Z_MIN,VS::CANVAS_ITEM_Z_MAX);
	else
		p_z=ci->z;

	for(int i=0;i<child_item_count;i++) {

		if (!child_items[i]->behind)
			continue;
		_render_canvas_item(child_items[i],xform,p_clip_rect,modulate,p_z,z_list,z_last_list,(Item*)ci->final_clip_owner,p_material_owner);
	}

	if (ci->copy_back_buffer) {

		ci->copy_back_buffer->screen_rect = xform.xform(ci->copy_back_buffer->rect).clip(p_clip_rect);
	}

	if ((!ci->commands.empty() && p_clip_rect.intersects(global_rect)) || ci->vp_render || ci->copy_back_buffer) {
		//something to draw?
		ci->final_transform=xform;
		ci->final_modulate=Color(modulate.r*ci->self_modulate.r, modulate.g*ci->self_modulate.g, modulate.b*ci->self_modulate.b, modulate.a*ci->self_modulate.a );
		ci->global_rect_cache=global_rect;
		ci->global_rect_cache.pos-=p_clip_rect.pos;
		ci->light_masked=false;

		int zidx = p_z-VS::CANVAS_ITEM_Z_MIN;

		if (z_last_list[zidx]) {
			z_last_list[zidx]->next=ci;
			z_last_list[zidx]=ci;

		} else {
			z_list[zidx]=ci;
			z_last_list[zidx]=ci;
		}

		ci->next=NULL;

	}

	for(int i=0;i<child_item_count;i++) {

		if (child_items[i]->behind)
			continue;
		_render_canvas_item(child_items[i],xform,p_clip_rect,modulate,p_z,z_list,z_last_list,(Item*)ci->final_clip_owner,p_material_owner);
	}

}

void VisualServerCanvas::_light_mask_canvas_items(int p_z,RasterizerCanvas::Item *p_canvas_item,RasterizerCanvas::Light *p_masked_lights) {

	if (!p_masked_lights)
		return;

	RasterizerCanvas::Item *ci=p_canvas_item;

	while(ci) {

		RasterizerCanvas::Light *light=p_masked_lights;
		while(light) {

			if (ci->light_mask&light->item_mask && p_z>=light->z_min && p_z<=light->z_max && ci->global_rect_cache.intersects_transformed(light->xform_cache,light->rect_cache)) {
				ci->light_masked=true;
			}

			light=light->mask_next_ptr;
		}

		ci=ci->next;
	}




}

void VisualServerCanvas::render_canvas(Canvas *p_canvas, const Matrix32 &p_transform, RasterizerCanvas::Light *p_lights, RasterizerCanvas::Light *p_masked_lights, const Rect2 &p_clip_rect) {

	VSG::canvas_render->canvas_begin();

	int l = p_canvas->child_items.size();
	Canvas::ChildItem *ci=p_canvas->child_items.ptr();

	bool has_mirror=false;
	for(int i=0;i<l;i++) {
		if (ci[i].mirror.x || ci[i].mirror.y) {
			has_mirror=true;
			break;
		}
	}


	if (!has_mirror) {

		static const int z_range = VS::CANVAS_ITEM_Z_MAX-VS::CANVAS_ITEM_Z_MIN+1;
		RasterizerCanvas::Item *z_list[z_range];
		RasterizerCanvas::Item *z_last_list[z_range];

		for(int i=0;i<z_range;i++) {
			z_list[i]=NULL;
			z_last_list[i]=NULL;
		}
		for(int i=0;i<l;i++) {
			_render_canvas_item(ci[i].item,p_transform,p_clip_rect,Color(1,1,1,1),0,z_list,z_last_list,NULL,NULL);
		}

		for(int i=0;i<z_range;i++) {
			if (!z_list[i])
				continue;

			if (p_masked_lights) {
				_light_mask_canvas_items(VS::CANVAS_ITEM_Z_MIN+i,z_list[i],p_masked_lights);
			}

			VSG::canvas_render->canvas_render_items(z_list[i],VS::CANVAS_ITEM_Z_MIN+i,p_canvas->modulate,p_lights);
		}
	} else {

		for(int i=0;i<l;i++) {

			Canvas::ChildItem& ci=p_canvas->child_items[i];
			_render_canvas_item_tree(ci.item,p_transform,p_clip_rect,p_canvas->modulate,p_lights);

			//mirroring (useful for scrolling backgrounds)
			if (ci.mirror.x!=0) {

				Matrix32 xform2 = p_transform * Matrix32(0,Vector2(ci.mirror.x,0));
				_render_canvas_item_tree(ci.item,xform2,p_clip_rect,p_canvas->modulate,p_lights);
			}
			if (ci.mirror.y!=0) {

				Matrix32 xform2 = p_transform * Matrix32(0,Vector2(0,ci.mirror.y));
				_render_canvas_item_tree(ci.item,xform2,p_clip_rect,p_canvas->modulate,p_lights);
			}
			if (ci.mirror.y!=0 && ci.mirror.x!=0) {

				Matrix32 xform2 = p_transform * Matrix32(0,ci.mirror);
				_render_canvas_item_tree(ci.item,xform2,p_clip_rect,p_canvas->modulate,p_lights);
			}

		}
	}

}


RID VisualServerCanvas::canvas_create() {

	Canvas * canvas = memnew( Canvas );
	ERR_FAIL_COND_V(!canvas,RID());
	RID rid = canvas_owner.make_rid( canvas );

	return rid;
}

void VisualServerCanvas::canvas_set_item_mirroring(RID p_canvas,RID p_item,const Point2& p_mirroring) {

	Canvas * canvas = canvas_owner.getornull(p_canvas);
	ERR_FAIL_COND(!canvas);
	Item *canvas_item = canvas_item_owner.getornull(p_item);
	ERR_FAIL_COND(!canvas_item);

	int idx = canvas->find_item(canvas_item);
	ERR_FAIL_COND(idx==-1);
	canvas->child_items[idx].mirror=p_mirroring;

}
void VisualServerCanvas::canvas_set_modulate(RID p_canvas,const Color& p_color) {

	Canvas * canvas = canvas_owner.get(p_canvas);
	ERR_FAIL_COND(!canvas);
	canvas->modulate=p_color;
}


RID VisualServerCanvas::canvas_item_create() {

	Item *canvas_item = memnew( Item );
	ERR_FAIL_COND_V(!canvas_item,RID());

	return canvas_item_owner.make_rid( canvas_item );
}

void VisualServerCanvas::canvas_item_set_parent(RID p_item,RID p_parent) {


	Item *canvas_item = canvas_item_owner.getornull( p_item );
	ERR_FAIL_COND(!canvas_item);

	if (canvas_item->parent.is_valid()) {

		if (canvas_owner.owns(canvas_item->parent)) {

			Canvas *canvas = canvas_owner.get(canvas_item->parent);
			canvas->erase_item(canvas_item);
		} else if (canvas_item_owner.owns(canvas_item->parent)) {

			Item *item_owner = canvas_item_owner.get(canvas_item->parent);
			item_owner->child_items.erase(canvas_item);
		}

		canvas_item->parent=RID();
	}


	if (p_parent.is_valid()) {
		if (canvas_owner.owns(p_parent)) {

			Canvas *canvas = canvas_owner.get(p_parent);
			Canvas::ChildItem ci;
			ci.item=canvas_item;
			canvas->child_items.push_back(ci);
			canvas->children_order_dirty=true;
		} else if (canvas_item_owner.owns(p_parent)) {

			Item *item_owner = canvas_item_owner.get(p_parent);
			item_owner->child_items.push_back(canvas_item);
			item_owner->children_order_dirty=true;

		} else {

			ERR_EXPLAIN("Invalid parent");
			ERR_FAIL();
		}


	}

	canvas_item->parent=p_parent;


}
void VisualServerCanvas::canvas_item_set_visible(RID p_item,bool p_visible){

	Item *canvas_item = canvas_item_owner.getornull( p_item );
	ERR_FAIL_COND(!canvas_item);

	canvas_item->visible=p_visible;

}
void VisualServerCanvas::canvas_item_set_light_mask(RID p_item,int p_mask){

	Item *canvas_item = canvas_item_owner.getornull( p_item );
	ERR_FAIL_COND(!canvas_item);

	canvas_item->light_mask=p_mask;

}

void VisualServerCanvas::canvas_item_set_transform(RID p_item, const Matrix32& p_transform){

	Item *canvas_item = canvas_item_owner.getornull( p_item );
	ERR_FAIL_COND(!canvas_item);

	canvas_item->xform=p_transform;

}
void VisualServerCanvas::canvas_item_set_clip(RID p_item, bool p_clip){

	Item *canvas_item = canvas_item_owner.getornull( p_item );
	ERR_FAIL_COND(!canvas_item);

	canvas_item->clip=p_clip;

}
void VisualServerCanvas::canvas_item_set_distance_field_mode(RID p_item, bool p_enable){

	Item *canvas_item = canvas_item_owner.getornull( p_item );
	ERR_FAIL_COND(!canvas_item);

	canvas_item->distance_field=p_enable;


}
void VisualServerCanvas::canvas_item_set_custom_rect(RID p_item, bool p_custom_rect,const Rect2& p_rect){

	Item *canvas_item = canvas_item_owner.getornull( p_item );
	ERR_FAIL_COND(!canvas_item);

	canvas_item->custom_rect=p_custom_rect;
	canvas_item->rect=p_rect;

}
void VisualServerCanvas::canvas_item_set_modulate(RID p_item, const Color& p_color) {

	Item *canvas_item = canvas_item_owner.getornull( p_item );
	ERR_FAIL_COND(!canvas_item);

	canvas_item->modulate=p_color;

}
void VisualServerCanvas::canvas_item_set_self_modulate(RID p_item, const Color& p_color){

	Item *canvas_item = canvas_item_owner.getornull( p_item );
	ERR_FAIL_COND(!canvas_item);

	canvas_item->self_modulate=p_color;

}

void VisualServerCanvas::canvas_item_set_draw_behind_parent(RID p_item, bool p_enable){

	Item *canvas_item = canvas_item_owner.getornull( p_item );
	ERR_FAIL_COND(!canvas_item);

	canvas_item->behind=p_enable;

}


void VisualServerCanvas::canvas_item_add_line(RID p_item, const Point2& p_from, const Point2& p_to,const Color& p_color,float p_width,bool p_antialiased) {

	Item *canvas_item = canvas_item_owner.getornull( p_item );
	ERR_FAIL_COND(!canvas_item);

	Item::CommandLine * line = memnew( Item::CommandLine );
	ERR_FAIL_COND(!line);
	line->color=p_color;
	line->from=p_from;
	line->to=p_to;
	line->width=p_width;
	line->antialiased=p_antialiased;
	canvas_item->rect_dirty=true;


	canvas_item->commands.push_back(line);
}

void VisualServerCanvas::canvas_item_add_rect(RID p_item, const Rect2& p_rect, const Color& p_color) {

	Item *canvas_item = canvas_item_owner.getornull( p_item );
	ERR_FAIL_COND(!canvas_item);

	Item::CommandRect * rect = memnew( Item::CommandRect );
	ERR_FAIL_COND(!rect);
	rect->modulate=p_color;
	rect->rect=p_rect;
	canvas_item->rect_dirty=true;

	canvas_item->commands.push_back(rect);
}

void VisualServerCanvas::canvas_item_add_circle(RID p_item, const Point2& p_pos, float p_radius,const Color& p_color) {


	Item *canvas_item = canvas_item_owner.getornull( p_item );
	ERR_FAIL_COND(!canvas_item);

	Item::CommandCircle * circle = memnew( Item::CommandCircle );
	ERR_FAIL_COND(!circle);
	circle->color=p_color;
	circle->pos=p_pos;
	circle->radius=p_radius;

	canvas_item->commands.push_back(circle);

}

void VisualServerCanvas::canvas_item_add_texture_rect(RID p_item, const Rect2& p_rect, RID p_texture,bool p_tile,const Color& p_modulate,bool p_transpose) {

	Item *canvas_item = canvas_item_owner.getornull( p_item );
	ERR_FAIL_COND(!canvas_item);

	Item::CommandRect * rect = memnew( Item::CommandRect );
	ERR_FAIL_COND(!rect);
	rect->modulate=p_modulate;
	rect->rect=p_rect;
	rect->flags=0;
	if (p_tile) {
		rect->flags|=RasterizerCanvas::CANVAS_RECT_TILE;
		rect->flags|=RasterizerCanvas::CANVAS_RECT_REGION;
		rect->source=Rect2(0,0,p_rect.size.width,p_rect.size.height);
	}

	if (p_rect.size.x<0) {

		rect->flags|=RasterizerCanvas::CANVAS_RECT_FLIP_H;
		rect->rect.size.x = -rect->rect.size.x;
	}
	if (p_rect.size.y<0) {

		rect->flags|=RasterizerCanvas::CANVAS_RECT_FLIP_V;
		rect->rect.size.y = -rect->rect.size.y;
	}
	if (p_transpose) {
		rect->flags|=RasterizerCanvas::CANVAS_RECT_TRANSPOSE;
		SWAP(rect->rect.size.x, rect->rect.size.y);
	}
	rect->texture=p_texture;
	canvas_item->rect_dirty=true;
	canvas_item->commands.push_back(rect);
}

void VisualServerCanvas::canvas_item_add_texture_rect_region(RID p_item, const Rect2& p_rect, RID p_texture,const Rect2& p_src_rect,const Color& p_modulate,bool p_transpose)  {

	Item *canvas_item = canvas_item_owner.getornull( p_item );
	ERR_FAIL_COND(!canvas_item);

	Item::CommandRect * rect = memnew( Item::CommandRect );
	ERR_FAIL_COND(!rect);
	rect->modulate=p_modulate;
	rect->rect=p_rect;
	rect->texture=p_texture;
	rect->source=p_src_rect;
	rect->flags=RasterizerCanvas::CANVAS_RECT_REGION;

	if (p_rect.size.x<0) {

		rect->flags|=RasterizerCanvas::CANVAS_RECT_FLIP_H;
		rect->rect.size.x = -rect->rect.size.x;
	}
	if (p_rect.size.y<0) {

		rect->flags|=RasterizerCanvas::CANVAS_RECT_FLIP_V;
		rect->rect.size.y = -rect->rect.size.y;
	}
	if (p_transpose) {
		rect->flags|=RasterizerCanvas::CANVAS_RECT_TRANSPOSE;
		SWAP(rect->rect.size.x, rect->rect.size.y);
	}

	canvas_item->rect_dirty=true;

	canvas_item->commands.push_back(rect);

}

void VisualServerCanvas::canvas_item_add_nine_patch(RID p_item, const Rect2& p_rect, const Rect2& p_source, RID p_texture,const Vector2& p_topleft, const Vector2& p_bottomright,VS::NinePatchAxisMode p_x_axis_mode, VS::NinePatchAxisMode p_y_axis_mode,bool p_draw_center,const Color& p_modulate) {



	Item *canvas_item = canvas_item_owner.getornull( p_item );
	ERR_FAIL_COND(!canvas_item);

	Item::CommandNinePatch * style = memnew( Item::CommandNinePatch );
	ERR_FAIL_COND(!style);
	style->texture=p_texture;
	style->rect=p_rect;
	style->source=p_source;
	style->draw_center=p_draw_center;
	style->color=p_modulate;
	style->margin[MARGIN_LEFT]=p_topleft.x;
	style->margin[MARGIN_TOP]=p_topleft.y;
	style->margin[MARGIN_RIGHT]=p_bottomright.x;
	style->margin[MARGIN_BOTTOM]=p_bottomright.y;
	style->axis_x=p_x_axis_mode;
	style->axis_y=p_y_axis_mode;
	canvas_item->rect_dirty=true;

	canvas_item->commands.push_back(style);
}
void VisualServerCanvas::canvas_item_add_primitive(RID p_item,const Vector<Point2>& p_points, const Vector<Color>& p_colors,const Vector<Point2>& p_uvs, RID p_texture,float p_width) {

	Item *canvas_item = canvas_item_owner.getornull( p_item );
	ERR_FAIL_COND(!canvas_item);

	Item::CommandPrimitive * prim = memnew( Item::CommandPrimitive );
	ERR_FAIL_COND(!prim);
	prim->texture=p_texture;
	prim->points=p_points;
	prim->uvs=p_uvs;
	prim->colors=p_colors;
	prim->width=p_width;
	canvas_item->rect_dirty=true;

	canvas_item->commands.push_back(prim);
}

void VisualServerCanvas::canvas_item_add_polygon(RID p_item, const Vector<Point2>& p_points, const Vector<Color>& p_colors,const Vector<Point2>& p_uvs, RID p_texture) {


	Item *canvas_item = canvas_item_owner.getornull( p_item );
	ERR_FAIL_COND(!canvas_item);
#ifdef DEBUG_ENABLED
	int pointcount = p_points.size();
	ERR_FAIL_COND(pointcount<3);
	int color_size=p_colors.size();
	int uv_size=p_uvs.size();
	ERR_FAIL_COND(color_size!=0 && color_size!=1 && color_size!=pointcount);
	ERR_FAIL_COND(uv_size!=0 && (uv_size!=pointcount || !p_texture.is_valid()));
#endif
	Vector<int> indices = Geometry::triangulate_polygon(p_points);

	if (indices.empty()) {

		ERR_EXPLAIN("Bad Polygon!");
		ERR_FAIL_V();
	}

	Item::CommandPolygon * polygon = memnew( Item::CommandPolygon );
	ERR_FAIL_COND(!polygon);
	polygon->texture=p_texture;
	polygon->points=p_points;
	polygon->uvs=p_uvs;
	polygon->colors=p_colors;
	polygon->indices=indices;
	polygon->count=indices.size();
	canvas_item->rect_dirty=true;

	canvas_item->commands.push_back(polygon);

}


void VisualServerCanvas::canvas_item_add_triangle_array(RID p_item, const Vector<int>& p_indices, const Vector<Point2>& p_points, const Vector<Color>& p_colors,const Vector<Point2>& p_uvs, RID p_texture, int p_count) {


	Item *canvas_item = canvas_item_owner.getornull( p_item );
	ERR_FAIL_COND(!canvas_item);

	int ps = p_points.size();
	ERR_FAIL_COND(!p_colors.empty() && p_colors.size()!=ps && p_colors.size()!=1);
	ERR_FAIL_COND(!p_uvs.empty() && p_uvs.size()!=ps);

	Vector<int> indices = p_indices;

	int count = p_count * 3;

	if (indices.empty()) {

		ERR_FAIL_COND( ps % 3 != 0 );
		if (p_count == -1)
			count = ps;
	} else {

		ERR_FAIL_COND( indices.size() % 3 != 0 );
		if (p_count == -1)
			count = indices.size();
	}

	Item::CommandPolygon * polygon = memnew( Item::CommandPolygon );
	ERR_FAIL_COND(!polygon);
	polygon->texture=p_texture;
	polygon->points=p_points;
	polygon->uvs=p_uvs;
	polygon->colors=p_colors;
	polygon->indices=indices;
	polygon->count = count;
	canvas_item->rect_dirty=true;

	canvas_item->commands.push_back(polygon);
}


void VisualServerCanvas::canvas_item_add_set_transform(RID p_item,const Matrix32& p_transform) {


	Item *canvas_item = canvas_item_owner.getornull( p_item );
	ERR_FAIL_COND(!canvas_item);

	Item::CommandTransform * tr = memnew( Item::CommandTransform );
	ERR_FAIL_COND(!tr);
	tr->xform=p_transform;

	canvas_item->commands.push_back(tr);

}

void VisualServerCanvas::canvas_item_add_mesh(RID p_item, const RID& p_mesh,RID p_skeleton){

	Item *canvas_item = canvas_item_owner.getornull( p_item );
	ERR_FAIL_COND(!canvas_item);

	Item::CommandMesh * m = memnew( Item::CommandMesh );
	ERR_FAIL_COND(!m);
	m->mesh=p_mesh;
	m->skeleton=p_skeleton;

	canvas_item->commands.push_back(m);
}
void VisualServerCanvas::canvas_item_add_multimesh(RID p_item, RID p_mesh,RID p_skeleton){

	Item *canvas_item = canvas_item_owner.getornull( p_item );
	ERR_FAIL_COND(!canvas_item);

	Item::CommandMultiMesh * mm = memnew( Item::CommandMultiMesh );
	ERR_FAIL_COND(!mm);
	mm->multimesh=p_mesh;
	mm->skeleton=p_skeleton;

	canvas_item->commands.push_back(mm);

}

void VisualServerCanvas::canvas_item_add_clip_ignore(RID p_item, bool p_ignore){


	Item *canvas_item = canvas_item_owner.getornull( p_item );
	ERR_FAIL_COND(!canvas_item);

	Item::CommandClipIgnore * ci = memnew( Item::CommandClipIgnore);
	ERR_FAIL_COND(!ci);
	ci->ignore=p_ignore;

	canvas_item->commands.push_back(ci);
}
void VisualServerCanvas::canvas_item_set_sort_children_by_y(RID p_item, bool p_enable){


	Item *canvas_item = canvas_item_owner.getornull( p_item );
	ERR_FAIL_COND(!canvas_item);

	canvas_item->sort_y=p_enable;
}
void VisualServerCanvas::canvas_item_set_z(RID p_item, int p_z){

	ERR_FAIL_COND(p_z<VS::CANVAS_ITEM_Z_MIN || p_z>VS::CANVAS_ITEM_Z_MAX);

	Item *canvas_item = canvas_item_owner.getornull( p_item );
	ERR_FAIL_COND(!canvas_item);

	canvas_item->z=p_z;
}
void VisualServerCanvas::canvas_item_set_z_as_relative_to_parent(RID p_item, bool p_enable){

	Item *canvas_item = canvas_item_owner.getornull( p_item );
	ERR_FAIL_COND(!canvas_item);

	canvas_item->z_relative=p_enable;

}
void VisualServerCanvas::canvas_item_set_copy_to_backbuffer(RID p_item, bool p_enable,const Rect2& p_rect){


	Item *canvas_item = canvas_item_owner.getornull( p_item );
	ERR_FAIL_COND(!canvas_item);
	if (bool(canvas_item->copy_back_buffer!=NULL) !=p_enable) {
		if (p_enable) {
			canvas_item->copy_back_buffer = memnew( RasterizerCanvas::Item::CopyBackBuffer );
		} else {
			memdelete(canvas_item->copy_back_buffer);
			canvas_item->copy_back_buffer=NULL;
		}
	}

	if (p_enable) {
		canvas_item->copy_back_buffer->rect=p_rect;
		canvas_item->copy_back_buffer->full=p_rect==Rect2();
	}

}

void VisualServerCanvas::canvas_item_clear(RID p_item){

	Item *canvas_item = canvas_item_owner.getornull( p_item );
	ERR_FAIL_COND(!canvas_item);

	canvas_item->clear();
}
void VisualServerCanvas::canvas_item_set_draw_index(RID p_item,int p_index){

	Item *canvas_item = canvas_item_owner.getornull( p_item );
	ERR_FAIL_COND(!canvas_item);

	canvas_item->index=p_index;

	if (canvas_item_owner.owns( canvas_item->parent)) {
		Item *canvas_item_parent = canvas_item_owner.getornull( canvas_item->parent );
		canvas_item_parent->children_order_dirty=true;
		return;
	}

	Canvas* canvas = canvas_owner.getornull( canvas_item->parent );
	if (canvas) {
		canvas->children_order_dirty=true;
		return;
	}

}

void VisualServerCanvas::canvas_item_set_material(RID p_item, RID p_material){

	Item *canvas_item = canvas_item_owner.get( p_item );
	ERR_FAIL_COND(!canvas_item);

	canvas_item->material=p_material;
}

void VisualServerCanvas::canvas_item_set_use_parent_material(RID p_item, bool p_enable){

	Item *canvas_item = canvas_item_owner.get( p_item );
	ERR_FAIL_COND(!canvas_item);

	canvas_item->use_parent_material=p_enable;

}

RID VisualServerCanvas::canvas_light_create(){

	RasterizerCanvas::Light *clight = memnew( RasterizerCanvas::Light );
	clight->light_internal = VSG::canvas_render->light_internal_create();
	return canvas_light_owner.make_rid(clight);

}
void VisualServerCanvas::canvas_light_attach_to_canvas(RID p_light,RID p_canvas){

	RasterizerCanvas::Light *clight = canvas_light_owner.get(p_light);
	ERR_FAIL_COND(!clight);

	if (clight->canvas.is_valid()) {

		Canvas *canvas = canvas_owner.getornull(clight->canvas);
		canvas->lights.erase(clight);
	}

	if (!canvas_owner.owns(p_canvas))
		p_canvas=RID();

	clight->canvas=p_canvas;

	if (clight->canvas.is_valid()) {

		Canvas *canvas = canvas_owner.get(clight->canvas);
		canvas->lights.insert(clight);
	}
}


void VisualServerCanvas::canvas_light_set_enabled(RID p_light, bool p_enabled){

	RasterizerCanvas::Light *clight = canvas_light_owner.get(p_light);
	ERR_FAIL_COND(!clight);

	clight->enabled=p_enabled;

}
void VisualServerCanvas::canvas_light_set_scale(RID p_light, float p_scale){


	RasterizerCanvas::Light *clight = canvas_light_owner.get(p_light);
	ERR_FAIL_COND(!clight);

	clight->scale=p_scale;

}
void VisualServerCanvas::canvas_light_set_transform(RID p_light, const Matrix32& p_transform){


	RasterizerCanvas::Light *clight = canvas_light_owner.get(p_light);
	ERR_FAIL_COND(!clight);

	clight->xform=p_transform;

}
void VisualServerCanvas::canvas_light_set_texture(RID p_light, RID p_texture){


	RasterizerCanvas::Light *clight = canvas_light_owner.get(p_light);
	ERR_FAIL_COND(!clight);

	clight->texture=p_texture;

}
void VisualServerCanvas::canvas_light_set_texture_offset(RID p_light, const Vector2& p_offset){


	RasterizerCanvas::Light *clight = canvas_light_owner.get(p_light);
	ERR_FAIL_COND(!clight);

	clight->texture_offset=p_offset;

}
void VisualServerCanvas::canvas_light_set_color(RID p_light, const Color& p_color){



	RasterizerCanvas::Light *clight = canvas_light_owner.get(p_light);
	ERR_FAIL_COND(!clight);

	clight->color=p_color;
}
void VisualServerCanvas::canvas_light_set_height(RID p_light, float p_height){


	RasterizerCanvas::Light *clight = canvas_light_owner.get(p_light);
	ERR_FAIL_COND(!clight);

	clight->height=p_height;

}
void VisualServerCanvas::canvas_light_set_energy(RID p_light, float p_energy){


	RasterizerCanvas::Light *clight = canvas_light_owner.get(p_light);
	ERR_FAIL_COND(!clight);

	clight->energy=p_energy;

}
void VisualServerCanvas::canvas_light_set_z_range(RID p_light, int p_min_z,int p_max_z){


	RasterizerCanvas::Light *clight = canvas_light_owner.get(p_light);
	ERR_FAIL_COND(!clight);

	clight->z_min=p_min_z;
	clight->z_max=p_max_z;

}
void VisualServerCanvas::canvas_light_set_layer_range(RID p_light, int p_min_layer,int p_max_layer){


	RasterizerCanvas::Light *clight = canvas_light_owner.get(p_light);
	ERR_FAIL_COND(!clight);


	clight->layer_max=p_max_layer;
	clight->layer_min=p_min_layer;


}
void VisualServerCanvas::canvas_light_set_item_cull_mask(RID p_light, int p_mask){


	RasterizerCanvas::Light *clight = canvas_light_owner.get(p_light);
	ERR_FAIL_COND(!clight);

	clight->item_mask=p_mask;

}
void VisualServerCanvas::canvas_light_set_item_shadow_cull_mask(RID p_light, int p_mask){

	RasterizerCanvas::Light *clight = canvas_light_owner.get(p_light);
	ERR_FAIL_COND(!clight);

	clight->item_shadow_mask=p_mask;

}
void VisualServerCanvas::canvas_light_set_mode(RID p_light, VS::CanvasLightMode p_mode){

	RasterizerCanvas::Light *clight = canvas_light_owner.get(p_light);
	ERR_FAIL_COND(!clight);

	clight->mode=p_mode;

}


void VisualServerCanvas::canvas_light_set_shadow_enabled(RID p_light, bool p_enabled){

	RasterizerCanvas::Light *clight = canvas_light_owner.get(p_light);
	ERR_FAIL_COND(!clight);

	if (clight->shadow_buffer.is_valid()==p_enabled)
		return;
	if (p_enabled) {
		clight->shadow_buffer=VSG::storage->canvas_light_shadow_buffer_create(clight->shadow_buffer_size);
	} else {
		VSG::storage->free(clight->shadow_buffer);
		clight->shadow_buffer=RID();
	}

}
void VisualServerCanvas::canvas_light_set_shadow_buffer_size(RID p_light, int p_size){

	ERR_FAIL_COND(p_size<32 || p_size>16384);

	RasterizerCanvas::Light *clight = canvas_light_owner.get(p_light);
	ERR_FAIL_COND(!clight);

	int new_size = nearest_power_of_2(p_size);;
	if (new_size==clight->shadow_buffer_size)
		return;

	clight->shadow_buffer_size=nearest_power_of_2(p_size);

	if (clight->shadow_buffer.is_valid()) {
		VSG::storage->free(clight->shadow_buffer);
		clight->shadow_buffer=VSG::storage->canvas_light_shadow_buffer_create(clight->shadow_buffer_size);
	}
}

void VisualServerCanvas::canvas_light_set_shadow_gradient_length(RID p_light, float p_length) {

	ERR_FAIL_COND(p_length<0);

	RasterizerCanvas::Light *clight = canvas_light_owner.get(p_light);
	ERR_FAIL_COND(!clight);

	clight->shadow_gradient_length=p_length;

}
void VisualServerCanvas::canvas_light_set_shadow_filter(RID p_light, VS::CanvasLightShadowFilter p_filter) {

	RasterizerCanvas::Light *clight = canvas_light_owner.get(p_light);
	ERR_FAIL_COND(!clight);

	clight->shadow_filter=p_filter;

}
void VisualServerCanvas::canvas_light_set_shadow_color(RID p_light, const Color& p_color) {

	RasterizerCanvas::Light *clight = canvas_light_owner.get(p_light);
	ERR_FAIL_COND(!clight);

	clight->shadow_color=p_color;
}



RID VisualServerCanvas::canvas_light_occluder_create() {

	RasterizerCanvas::LightOccluderInstance *occluder = memnew( RasterizerCanvas::LightOccluderInstance );

	return canvas_light_occluder_owner.make_rid(occluder);
}
void VisualServerCanvas::canvas_light_occluder_attach_to_canvas(RID p_occluder,RID p_canvas){

	RasterizerCanvas::LightOccluderInstance *occluder = canvas_light_occluder_owner.get(p_occluder);
	ERR_FAIL_COND(!occluder);

	if (occluder->canvas.is_valid()) {

		Canvas *canvas = canvas_owner.get(occluder->canvas);
		canvas->occluders.erase(occluder);
	}

	if (!canvas_owner.owns(p_canvas))
		p_canvas=RID();

	occluder->canvas=p_canvas;

	if (occluder->canvas.is_valid()) {

		Canvas *canvas = canvas_owner.get(occluder->canvas);
		canvas->occluders.insert(occluder);
	}
}
void VisualServerCanvas::canvas_light_occluder_set_enabled(RID p_occluder,bool p_enabled) {

	RasterizerCanvas::LightOccluderInstance *occluder = canvas_light_occluder_owner.get(p_occluder);
	ERR_FAIL_COND(!occluder);

	occluder->enabled=p_enabled;
}
void VisualServerCanvas::canvas_light_occluder_set_polygon(RID p_occluder,RID p_polygon) {

	RasterizerCanvas::LightOccluderInstance *occluder = canvas_light_occluder_owner.get(p_occluder);
	ERR_FAIL_COND(!occluder);

	if (occluder->polygon.is_valid()) {
		LightOccluderPolygon *occluder_poly = canvas_light_occluder_polygon_owner.get(p_polygon);
		if (occluder_poly) {
			occluder_poly->owners.erase(occluder);
		}
	}

	occluder->polygon=p_polygon;
	occluder->polygon_buffer=RID();

	if (occluder->polygon.is_valid()) {
		LightOccluderPolygon *occluder_poly = canvas_light_occluder_polygon_owner.get(p_polygon);
		if (!occluder_poly)
			occluder->polygon=RID();
		ERR_FAIL_COND(!occluder_poly);
		occluder_poly->owners.insert(occluder);
		occluder->polygon_buffer=occluder_poly->occluder;
		occluder->aabb_cache=occluder_poly->aabb;
		occluder->cull_cache=occluder_poly->cull_mode;
	}

}
void VisualServerCanvas::canvas_light_occluder_set_transform(RID p_occluder,const Matrix32& p_xform) {

	RasterizerCanvas::LightOccluderInstance *occluder = canvas_light_occluder_owner.get(p_occluder);
	ERR_FAIL_COND(!occluder);

	occluder->xform=p_xform;
}
void VisualServerCanvas::canvas_light_occluder_set_light_mask(RID p_occluder,int p_mask) {

	RasterizerCanvas::LightOccluderInstance *occluder = canvas_light_occluder_owner.get(p_occluder);
	ERR_FAIL_COND(!occluder);

	occluder->light_mask=p_mask;
}

RID VisualServerCanvas::canvas_occluder_polygon_create() {

	LightOccluderPolygon * occluder_poly = memnew( LightOccluderPolygon );
	occluder_poly->occluder=VSG::storage->canvas_light_occluder_create();
	return canvas_light_occluder_polygon_owner.make_rid(occluder_poly);

}
void VisualServerCanvas::canvas_occluder_polygon_set_shape(RID p_occluder_polygon,const PoolVector<Vector2>& p_shape,bool p_closed) {

	if (p_shape.size()<3) {
		canvas_occluder_polygon_set_shape_as_lines(p_occluder_polygon,p_shape);
		return;
	}

	PoolVector<Vector2> lines;
	int lc = p_shape.size()*2;

	lines.resize(lc-(p_closed?0:2));
	{
		PoolVector<Vector2>::Write w = lines.write();
		PoolVector<Vector2>::Read r = p_shape.read();

		int max=lc/2;
		if (!p_closed) {
			max--;
		}
		for(int i=0;i<max;i++) {

			Vector2 a = r[i];
			Vector2 b = r[(i+1)%(lc/2)];
			w[i*2+0]=a;
			w[i*2+1]=b;
		}

	}

	canvas_occluder_polygon_set_shape_as_lines(p_occluder_polygon,lines);
}
void VisualServerCanvas::canvas_occluder_polygon_set_shape_as_lines(RID p_occluder_polygon,const PoolVector<Vector2>& p_shape) {

	LightOccluderPolygon * occluder_poly = canvas_light_occluder_polygon_owner.get(p_occluder_polygon);
	ERR_FAIL_COND(!occluder_poly);
	ERR_FAIL_COND(p_shape.size()&1);

	int lc = p_shape.size();
	occluder_poly->aabb=Rect2();
	{
		PoolVector<Vector2>::Read r = p_shape.read();
		for(int i=0;i<lc;i++) {
			if (i==0)
				occluder_poly->aabb.pos=r[i];
			else
				occluder_poly->aabb.expand_to(r[i]);
		}
	}

	VSG::storage->canvas_light_occluder_set_polylines(occluder_poly->occluder,p_shape);
	for( Set<RasterizerCanvas::LightOccluderInstance*>::Element *E=occluder_poly->owners.front();E;E=E->next()) {
		E->get()->aabb_cache=occluder_poly->aabb;
	}
}


void VisualServerCanvas::canvas_occluder_polygon_set_cull_mode(RID p_occluder_polygon,VS::CanvasOccluderPolygonCullMode p_mode) {

	LightOccluderPolygon * occluder_poly = canvas_light_occluder_polygon_owner.get(p_occluder_polygon);
	ERR_FAIL_COND(!occluder_poly);
	occluder_poly->cull_mode=p_mode;
	for( Set<RasterizerCanvas::LightOccluderInstance*>::Element *E=occluder_poly->owners.front();E;E=E->next()) {
		E->get()->cull_cache=p_mode;
	}
}



bool VisualServerCanvas::free(RID p_rid) {

	if (canvas_owner.owns(p_rid)) {

		Canvas *canvas = canvas_owner.get(p_rid);
		ERR_FAIL_COND_V(!canvas,false);

		while(canvas->viewports.size()) {

			VisualServerViewport::Viewport *vp = VSG::viewport->viewport_owner.get(canvas->viewports.front()->get());
			ERR_FAIL_COND_V(!vp,true);

			Map<RID,VisualServerViewport::Viewport::CanvasData>::Element *E=vp->canvas_map.find(p_rid);
			ERR_FAIL_COND_V(!E,true);
			vp->canvas_map.erase(p_rid);

			canvas->viewports.erase( canvas->viewports.front() );
		}

		for (int i=0;i<canvas->child_items.size();i++) {

			canvas->child_items[i].item->parent=RID();
		}

		for (Set<RasterizerCanvas::Light*>::Element *E=canvas->lights.front();E;E=E->next()) {

			E->get()->canvas=RID();
		}

		for (Set<RasterizerCanvas::LightOccluderInstance*>::Element *E=canvas->occluders.front();E;E=E->next()) {

			E->get()->canvas=RID();
		}

		canvas_owner.free( p_rid );

		memdelete( canvas );

	} else if (canvas_item_owner.owns(p_rid)) {

		Item *canvas_item = canvas_item_owner.get(p_rid);
		ERR_FAIL_COND_V(!canvas_item,true);

		if (canvas_item->parent.is_valid()) {

			if (canvas_owner.owns(canvas_item->parent)) {

				Canvas *canvas = canvas_owner.get(canvas_item->parent);
				canvas->erase_item(canvas_item);
			} else if (canvas_item_owner.owns(canvas_item->parent)) {

				Item *item_owner = canvas_item_owner.get(canvas_item->parent);
				item_owner->child_items.erase(canvas_item);

			}
		}

		for (int i=0;i<canvas_item->child_items.size();i++) {

			canvas_item->child_items[i]->parent=RID();
		}

//		if (canvas_item->material) {
//			canvas_item->material->owners.erase(canvas_item);
//		}

		canvas_item_owner.free( p_rid );

		memdelete( canvas_item );

	} else if (canvas_light_owner.owns(p_rid)) {

		RasterizerCanvas::Light *canvas_light = canvas_light_owner.get(p_rid);
		ERR_FAIL_COND_V(!canvas_light,true);

		if (canvas_light->canvas.is_valid()) {
			Canvas* canvas = canvas_owner.get(canvas_light->canvas);
			if (canvas)
				canvas->lights.erase(canvas_light);
		}

		if (canvas_light->shadow_buffer.is_valid())
			VSG::storage->free(canvas_light->shadow_buffer);

		VSG::canvas_render->light_internal_free(canvas_light->light_internal);

		canvas_light_owner.free( p_rid );
		memdelete( canvas_light );

	} else if (canvas_light_occluder_owner.owns(p_rid)) {

		RasterizerCanvas::LightOccluderInstance *occluder = canvas_light_occluder_owner.get(p_rid);
		ERR_FAIL_COND_V(!occluder,true);

		if (occluder->polygon.is_valid()) {

			LightOccluderPolygon *occluder_poly = canvas_light_occluder_polygon_owner.get(occluder->polygon);
			if (occluder_poly) {
				occluder_poly->owners.erase(occluder);
			}

		}

		if (occluder->canvas.is_valid() && canvas_owner.owns(occluder->canvas)) {

			Canvas *canvas = canvas_owner.get(occluder->canvas);
			canvas->occluders.erase(occluder);

		}

		canvas_light_occluder_owner.free( p_rid );
		memdelete(occluder);

	} else if (canvas_light_occluder_polygon_owner.owns(p_rid)) {

		LightOccluderPolygon *occluder_poly = canvas_light_occluder_polygon_owner.get(p_rid);
		ERR_FAIL_COND_V(!occluder_poly,true);
		VSG::storage->free(occluder_poly->occluder);

		while(occluder_poly->owners.size()) {

			occluder_poly->owners.front()->get()->polygon=RID();
			occluder_poly->owners.erase( occluder_poly->owners.front() );
		}

		canvas_light_occluder_polygon_owner.free( p_rid );
		memdelete(occluder_poly);
	} else {
		return false;
	}

	return true;
}



VisualServerCanvas::VisualServerCanvas()
{

}
